Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden; it does disclose the categories of information returned (support status, access requirements, fragility), which is meaningful behavioral context for a discovery tool. It does not state that the call is read-only/side-effect free, whether it hits the network per provider, or how results are shaped, leaving gaps an agent would want closed.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.